Considering the low materials management efficiency and a serious shortage of informatization level in domestic offshore engineering enterprises, the significance of materials management is emphasized through the analysis of domestic and foreign advanced materials management theory. Taking the actual project of a company as the background, business demand for materials management is drawn through field investigation, and the structure of the management system is figured out based on the demand analysis. The structural modelling of the system is thus accomplished. Using Java language, combined with MyEclipse development environment and Oracle database, we develop a prototype system. The feasibility and validity of the system are testified through the demonstration of the actual project material management process.